change #include "interface.h" to <jtag/interface.h>

Changes from the flat namespace to heirarchical one.  Instead of writing:

	#include "interface.h"

the following form should be used.

	#include <jtag/interface.h>

The exception is from .c files in the same directory.

src/jtag/interfaces.h

@@ -35,7 +35,7 @@
  * for loading and unloading them dynamically from shared libraries.
  */
 
-#include "interface.h"
+#include <jtag/interface.h>
 
 /// Dynamically load all JTAG interface modules from specified directory.
 void jtag_interface_modules_load(const char *path);